The way this is set up, saving directly to the online server doesn't seem like it'd be hard to implement at all. It's just a matter of accessing that folder while in-game and directly loading/saving from there.
It's essentially set up as a sub-folder of the game saves folder, instead of as a completely separate thing.
Though that would mean you'd have to be online to access your saves. It wouldn't be accessible both ways like it is through Steam.







